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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a08b62d445363da1df5ad6beae3b6882d4e0ed4671e731e5438f7f6ac2d472b' 
  AND token = '+ojFgXdsxKBsRstf09F6Wd6mKWKsGOA7+1kYrGosIQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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