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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a4ffe11834a98e576c38b35b2014f0a1b52ca23c691f5a5efb390cac6f5ef53' 
  AND token = 'KKmtyBCAc7uv4yO/w2rp3tVN8E0gSTr6Qkmaha7ofJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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