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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baad5b6470b64291575955444de4f8c1f7542c3a14f94f5fb82c0705a0978440' 
  AND token = 'fMWaRY3/jcpMpG62vQ17Qs0+v5bnsk3E4am8cHt3x14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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