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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4061587f888fbc01a2a68d31799df878aa55bce9cd95cbd0e69d60b3303864' 
  AND token = '28KF8HfRG7jxluhi4XZWcU1fRSfVSDeq7XrRMujix+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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