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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0c2aa6a3417d30cf302657d61b5cfaab2ae63394956b2a2dd113fee30b0918' 
  AND token = 'ktuyrPsHqD294zT1/70BuqLeb6j1bU3u4oN7cAt2YtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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