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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa76d0adc19c4ea19aa0b0d3da9e75de53212feacb1394c31dfd11cbcf68d1f' 
  AND token = 'zQ/1s6vsBBzCnrvD8QbN2EzT1f6uPx7k8bRF1MXzAMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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