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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7482c673c89df735db34845d940d4807412d41a13d3bd7f081d45f6354fd82c' 
  AND token = 'pNs8HC3IzO9tPlVaSWvhE1A9pbYqnaYuN9NsrvkuGKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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