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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15e027dfd3c9b7d62cae39643266e6f081ab6b2898568865e386d4878b01fe7' 
  AND token = 'H6Nka54Q6GP2yRwQ5TWxGJtSibmm4c+J2l2RwgNMF14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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