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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417132a8121af2b1b91c296becdc88951e3b84e5df0ea62bd6a4fd02f12f8384' 
  AND token = '2aKxq0/U2+JHez7KiFxUJGJbW6Ek+1ySl85GuEzWoP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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