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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cb7f7f450d1f6db7f7a1542d87bedd2a10b21870e3b7ae7c007e9f79081403' 
  AND token = 'ClZ9Ug3sKcfmJJCW0rwFdWz+VP1JiQEDwmTl6Ux0bF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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