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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595f8d0b24af12860c0e56e92c9890edc3c619f54fedd29539c7e1bc11c96c7d' 
  AND token = 'BYDaJ5HnK7M2IgQrvK75saxkkAll8piWATxHXE00TLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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