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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f5787e075b287300d3c375fa2aaf7b32ef3c1d23ff3090ef8eb70c163f31e6b' 
  AND token = 'n3bk49sDhX1UkMvlaFIe3UQ7tjuScZDd9vnCpgTvpn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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