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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4bc2e93de23adfa73ad8a3eef405c64bc0c10c464a1f66be27d411503d572a' 
  AND token = 'mvBH53qA9ddh61/ljZ8lGZq3W3b49EIKkcjWePuX5sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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