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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a020e336ade070b9fb536629d86261ec16851d8bb80e1ab8b2179ef49b4c661' 
  AND token = 'XE5RMlp7jKGmh5TEM3OjcmMMLCwkVRS1Lar1IvxQblM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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