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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c766bd16a0f3881190f5010db8a7bcd2d8ae5bbf56319c83248d9d31cc1a2b' 
  AND token = 'vEzuozy/KcLqPBTK9u15IM+xBNbzuxz6FvlGsCoGfb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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