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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712b9c5daadb690b236b9f94d2469617227469ccf42137fe9d0864bcb997b555' 
  AND token = 'olihhtlAMoSVFd0Uv8IFsChzKGAdTV6d3WsBad6jUIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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