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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6852ed7d01cb6ab98981e18e06c0b4dab74cafa3bae4be0aca0617be44291a31' 
  AND token = 'MYWEFH9cBAsXpj4RfAy5KOI8YpnceRgCVVKki1FOZjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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