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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebfbd3c6ae16d631a4aed6c8c206ef7a6e937c5edb160da6fc2314b17ee21a1' 
  AND token = 'Tv6OY3PqQIMcBqtHwLrnD5Xc/QU/YS877wbVoOcyy3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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