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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71c6b95aa6cdf8d59c3a69797458072923076a9f8eb71e06feef540fd235aa1' 
  AND token = 'VpSBGiy1lSXCE4Bb1pgC/RpPVmnnpaaKuQpHYauxcrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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