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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de32be2c8fed04399dfbbbdea39363cbacdae3d4f6d085c22a978f9d008d4f5' 
  AND token = 'smtJufASryRUu3NHdOhAHN5MjTF79RahDgnAR7ecf7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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