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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a45cc1940e1101be9d52e632b53543820f2c0b7ae26fe072dea0bef6d9b2a89' 
  AND token = 'Veoj/5w4zwcj4TvXhyxjFwoHLT92ctTE22a4qLk4nbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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