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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979f13ce79450d30294962404fbaed7b404c66190b85870e6b76d06868e8e49b' 
  AND token = 'YGj3TOEYy2xYK0eRsNRT/beu9rwME+yf79ksCsc2Jko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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