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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '306c00e46659bf987862ac3552c52ed9f6ab81e13779d8c369e88880d6b699d1' 
  AND token = '+Cz328w1t9xLr/sO+sTBBsK2FO936mcEKOeAM10QngY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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