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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0806164f08063050bfe31309fb81cef5d47403141f01f8f9f69fd6043639924a' 
  AND token = 'S2HHmMzJZ0O2nMZOieEWih2EeYhMHq33y+xcyEpSDm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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