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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec62200a8a30f54e024174602d471308ae734ebe37f2383fc60a83dc5217c2b' 
  AND token = '2APtZBt9vmXHPv3ETdUiCCnVuDLcTdjwjVDLzVGpNUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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