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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c23b1cfcc87fc84ba7b6329bbc89ef077575b2c27b01648de1455f866cc9299' 
  AND token = 'PauR/L4Zi1mNCZ+HS1mYu+d9ZKjbRALg/t+YyfFIyd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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