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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c8fab4d3e8b628b951b76b8bd440486eed6c22a0a5d9ae25fffaba924fe62c' 
  AND token = 'VBaaY/SQlFedPafe79cF2bBMJqOFioa4spJyqW012yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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