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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7ae5235ba26b66bac51fc399f1f8c5cc1f50ad8ed2015caf43bc995443abc1' 
  AND token = 'eE/LZsmrTR2jns4u509CY+cWf6EzZMkqBP0o+tuicyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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