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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b9e4cdbf24d84050fb30d360f762773a849aee0468dc10037259357f700d6d' 
  AND token = '76uI2AF4RcCQCKv9x++v0u8hX6F1j+a8jHgPg5mIiJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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