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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dbfb30b13a6322fcccd6fbfed81b96713b04eb77a49f04aa7c38322d6c1017' 
  AND token = 'FL6+ixMSDDANiBfE7fScI+A02I2Xwjchp/kQwfXMAD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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