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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3519ed69889da4a60970255461838b26493f0de87172e396fb53057d19500b' 
  AND token = 'lZLlAXlJy7OVjZIRkS5cD08JGwkER9W4yA4ULgKaq0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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