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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62aafb0ff049c47e5f85312ab2aa5c8160dc87f2973711cb63b775a4f0c0094' 
  AND token = 'lSqP4kotVllBU2XsgowlctzKZfas0Per/D90SO8RS4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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