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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8dcbdcb0cfac16d08cbb540f7af4bd31666535edb4a733cd99adf7af91291e' 
  AND token = 'NARMJz1G3XBKBtiJj9QaeD1mGJvT3vihA1zZ7G8NtKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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