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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7d5b351801e0a2d0088d9ae3c1f3cd704b3261d8e5ab60a042fbe378909a86' 
  AND token = 'TcdiHANdCujpCkaBnwz+FSYkLJX6mEU/qeN7AOFs3+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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