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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8d7a94b8d5535e4cab99168a660f97b09ebbfc36fdc7ed4a704db9726adeea' 
  AND token = 'bub1nztMGbxen4OdIeq2V7mdarh18h4/X01NQ6u7ipc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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