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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233a4ecb0d429c3cbd1d6e56b1877223f62c5e2783ebc261dbd88ce2e0b19ec0' 
  AND token = '8MuYV/a3Izvz8RdYrprSEZ5a+sCHuVt8+LZJv4iyu50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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