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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b37536eea41d0557f69ccb58ac1319c66d9d8e18ea0aedc184071ed0998cf7' 
  AND token = 'orjN0DznWR1GPA4ik7Ddvb8Gi6/g7QM9duHh+gNXnMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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