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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893efbba79c3c7048b2599dbec629b4dc282844c3439c6129dcd1574148f11ca' 
  AND token = '5QbzDoOIAerlZukDBHD3i27gHywlc2ANWYmfgAG+BRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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