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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '352f932c64fe37c05200d00e1ecb24622b03950f68d7ffa7002c8bf0244ffd8b' 
  AND token = 'klKxYTkX5jWEFG7gpkBxIfk9F/Sq2HGuN6P21zIKTpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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