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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8254e7191ec08910f5cead2cf070eb019525c28caeba1e170626181a8879125' 
  AND token = '6n2adlZdBsMVEGQ/McO71wYGlhkP9ncfOVtIGKnt0i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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