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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9413c535c25dd665c89122dfd39d449be126ebf04c3f414339ea1402b693bf04' 
  AND token = 'MI+K40tOuTybDMRkuKEozTBPrORv5RrwL9B6iAxVXcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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