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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9182f16c78dc4d0ba008139930441bacfe8b88e8b201e9eb843fbb0faa27951b' 
  AND token = 'qAKPBU7yqZY8n+aMoE2F36XPe5Z4YyL0weiB504ECaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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