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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd379ba92b23364cefdf739ce842bd14a080dd7f43c4910b839a78c3042a696f' 
  AND token = 'fXtlwhPXbaWZ6st4XoFi6gS/2aUlrgj3Z3J0fm9kKPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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