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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0ad191dc0851bdcaee2905eec7a3b6b0183756287152970c9d270021bb4fab' 
  AND token = 'QooMicner6954MMzFhqkYsMxkwlPNMj9TdN0JSYQAmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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