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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf48c686345db30a1559bee09b5f1766c9197eb9eee7a28415313b399c836a1' 
  AND token = '164jBQ7f1Ei0/fRbBAmG+5v1H1D8wOR5YSdGj2arKQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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