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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2211bd98e4c04abaf2e48f3acd5153f51233f199051330b7163456b1c666ad8' 
  AND token = 'uPB+idypteXiP2cyboenuhRujrd+yAcYtTR8xwHyoVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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