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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aa2673a6f9cc804db2b9c8de50aa7a01135f2655158dd20fb27ec01cb1c3ffd' 
  AND token = '/Q3ghweZd/51NOOIQM9FxeX7OM9MF7wuQOsiDPNKSJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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