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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d06eaaf4b21817086b13ed8e9b3ad9d5109ee3a8876c5359ef6b6573a22f75' 
  AND token = 'cdVcjH0pPAQO4xYZaFfD0jFwHScRN1Q2OUQkyNiix6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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