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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c9e4949e9e6443cb8805dd5ba53a9eee63b779ad31a1a275e640f304828ffa' 
  AND token = 'qIfHfqzYRad1XKk0kvPRKF7CBW2XJvEicNV8i/8hymc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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