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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af83571be138d9b441593cf16f6838e2b24b15e1a5b744571039acb0e232b935' 
  AND token = 'YPiAWLJu2taeatVgGcxiojz5PPyshoC4f3tTAgLrL9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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