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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42daaba78b5afa037423c2d3305792f7b1db7dfc84d9774243bd110a1853138' 
  AND token = '1p+mNvJwip97OkFlTrHzFry2Y1gp90/D5SP/DSKFnWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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