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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c21bf204f8c3c791521e5d952dfba14fd1e07da66d4dc643fa5b5d0db3f2bd5' 
  AND token = '85ne1zNoTR56QyiE/ic2GgWeCV2mYufwnS1MvQxvcd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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