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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c09e14f0df50a3a988501e34cfb3e176f046258b627c9166850c0e7b8e358ff' 
  AND token = '8hqkgPqOMAre+NUA+WUy0Huv+SiqexAVHvqd33lLC4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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