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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008cb614f39fc84fa903bd735b87da3aba934899fa18404e4729659468e93c4f' 
  AND token = '3ADTF0z+HSK4Rpv+4yaGfW04lRn868kK4HnKX5KwEJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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