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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab9fce72e5c9c8a899abf645548e1cef2beed0f75a5678c0af086ff33c5870c' 
  AND token = '6jtZ3jaZ743ujnL68GAz5MFkCiTwGl78vZZQrTANjWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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