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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e174d68075dd78e7241e12a9e3a1e636f78f73cf8d21278edfc5bad3c9bd11' 
  AND token = 'OgxzF7hpQJyqQFPJ1X1wBTiv+Z17nT/6C3ytG19rpk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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