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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef67c8d344f855dbcbf98d25d46b9eb00ec81119b1f7e114a730e25d060752e7' 
  AND token = 'Xhte+IsQ+acTgWiI7mt/Gc/rM5DASixuy+zqXZSNz1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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