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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995d0036a2ae48504e0e2276c99a6854c99ad31eaae272781caf69979eafb8e3' 
  AND token = 'yj55yCbFCRp1N+w0onyzod/omaLiR3xEAn6MloCsKZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}