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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51ff1ff1a57ada850696553c0f386aaac02133c9799c31ecb031482b81e3a4d' 
  AND token = '84XdjrrMkemq9I9hD5E/zea1Gm++hyITK60N2q7mmeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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