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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82c482b93d4887c32065bb0435eb05502d22b449b122475432cba953758024a' 
  AND token = '0J3XC6IoDNACvXzzzLaeoql7L87BRCpdQxE6J2vW7P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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