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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75a7fea2bfb39d828b31c8046c5f205647eeecfb7ec5bacbf17e67a96a35f2d' 
  AND token = 'PdoVtHaWF3Ytffv70ZLB6VHWyWJzUJRpuRCRsU0Xg0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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