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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83875d44464d1c3ecb7d0eee54df48558f9593112dfa9584563c5284798a0d0c' 
  AND token = 'iGotw+PcK//07jZapipEHGujtA88z5xls0upL+3adMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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